Excelize: Unbounded row number in Rows.Columns makes GetRows and the Rows iterator loop for days

Summary A worksheet whose number is far past Excel's 1,048,576-row limit makes File.GetRows and the Rows iterator loop once for every missing row. The row limit is checked in Rows.Next, but not in Rows.Columns, which also reads elements. A 1.5 KB file with after an ordinary first row keeps GetRow...